Tunable structural phase transition and superconductivity in the Weyl semimetal Mo1-xWxTe2
Tunable structural phase transition and superconductivity in the Weyl semimetal Mo1-xWxTe2
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DOI：
10.1103/physrevb.101.140505
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发表时间：
2020-04-16
影响因子：
3.7
通讯作者：
Chu, C. W.
中科院分区：
文献类型：
--
作者：
Dahal, R.;Deng, L. Z.;Chu, C. W.
通过对掺杂和压力效应的系统研究，建立了Weyl半金属Mo_（1-x）W_xTe_2的结构转变、超导电性和掺杂之间的关系。在环境压力下的掺杂相关的电阻率测量结果表明，结构转变温度随W含量的增加在Mo 1-xWxTe 2线性增加。在常压下测得MoTe 2的结构转变温度为249 K，WTe 2的结构转变温度为613 K。温度相关的同步辐射X射线衍射测量进一步证实了在环境压力下的结构转变在WTe 2。发现压力持续抑制Mo（0.90）Wa（0.10）Te（2）、Mo_（0.60）W_（0.40）Te_2和Mo_（0.25）W_（0.75）Te_2的T_s，当T_s被抑制到较低温度时，Mo_（0.90）W_（0.10）Te_2和Mo_（0.60）W_（0.40）Te_2在1.25 K以上出现超导电性。
The relationship among structural transition, superconductivity, and doping in the Weyl semimetal Mo1-xWxTe2 has been established through a systematic study of the doping and pressure effects. Doping-dependent resistivity measurements at ambient pressure revealed that the structural transition temperature increases linearly with increasing W content in Mo1-xWxTe2. The observed structural transition temperature (T-s) of MoTe2 at ambient pressure is 249 K and that of WTe2 is 613 K. Temperature-dependent synchrotron x-ray diffraction measurements further confirmed the structural transition in WTe2 at ambient pressure. Pressure was found to continuously suppress the T-s in Mo(0.90)Wa(0.10)Te(2), Mo0.60W0.40Te2, and Mo0.25W0.75Te2, and superconductivity emerges in Mo0.90W0.10Te2 and Mo0.60W0.40Te2 above 1.25 K when T-s is suppressed to a lower temperature.